linux-kernel - Re: NFS regression? Odd delays and lockups accessing an NFS export.

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Message-ID: <4156b4tgrrsflla1svmu4jl6j5sme4a715@4ax.com>
Date:	Tue, 26 Aug 2008 06:23:37 +1000
From:	Grant Coady <grant_lkml@...o.com.au>
To:	Trond Myklebust <trond.myklebust@....uio.no>
Cc:	Ian Campbell <ijc@...lion.org.uk>,
	John Ronciak <john.ronciak@...il.com>,
	Grant Coady <gcoady.lk@...il.com>,
	linux-kernel@...r.kernel.org, neilb@...e.de, bfields@...ldses.org,
	linux-nfs@...r.kernel.org,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Bruce Allan <bruce.w.allan@...el.com>,
	PJ Waskiewicz <peter.p.waskiewicz.jr@...el.com>,
	John Ronciak <john.ronciak@...el.com>,
	e1000-devel@...ts.sourceforge.net
Subject: Re: NFS regression? Odd delays and lockups accessing an NFS export.

On Fri, 22 Aug 2008 14:56:53 -0700, Trond Myklebust <trond.myklebust@....uio.no> wrote:

>On Fri, 2008-08-22 at 22:37 +0100, Ian Campbell wrote:
>> I can ssh to the server fine. The same server also serves my NFS home
>> directory to the box I'm writing this from and I've not seen any trouble
>> with this box at all, it's a 2.6.18-xen box.
>
>OK... Are you able to reproduce the problem reliably?
>
>If so, can you provide me with a binary tcpdump or wireshark dump? If
>using tcpdump, then please use something like
>
>   tcpdump -w /tmp/dump.out -s 90000 host myserver.foo.bar and port 2049
                             ^^^^^^^^-->  typo?

man tcpdump:
       -s     Snarf  snaplen bytes of data from each packet rather than the default of
              68 (with SunOS's NIT, the minimum is actually 96).  68 bytes is adequate


I've reverted the NFS server to 2.6.24.7 -- inconclusive results for me 
'cos NFS stalls seem so random.

Grant.
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